CN109311054B - Method for controlling at least two mechanical oscillators - Google Patents

Method for controlling at least two mechanical oscillators Download PDF

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Publication number
CN109311054B
CN109311054B CN201780035215.9A CN201780035215A CN109311054B CN 109311054 B CN109311054 B CN 109311054B CN 201780035215 A CN201780035215 A CN 201780035215A CN 109311054 B CN109311054 B CN 109311054B
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China
Prior art keywords
oscillator
oscillators
frequency
mechanical
audio transducer
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CN201780035215.9A
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Chinese (zh)
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CN109311054A (en
Inventor
E·于纳尔
G·舍恩赫
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Mercedes Benz Group AG
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Daimler AG
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Publication of CN109311054A publication Critical patent/CN109311054A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/90—Details or parts not otherwise provided for
    • B60N2/976—Details or parts not otherwise provided for massaging systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0261—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken from a transducer or electrode connected to the driving transducer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H13/00—Measuring resonant frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/04—Frequency
    • G01H3/06—Frequency by electric means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Passenger Equipment (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

The invention relates to a method for controlling at least two mechanical oscillators (3), in particular in a motor vehicle (1), wherein each oscillator (3) oscillates in operation at a frequency which can be controlled by means of the power applied to the respective oscillator (3). Each of said oscillators (3) is controlled in a simplified and precise manner by: a single audio transducer (6) is arranged at a distance from each oscillator (3) and receives an electrical signal, wherein the electrical signal is Fourier transformed such that a Fourier spectrum is determined, and the frequency of the respective oscillator (3) is determined from the extremum of the Fourier spectrum. The invention also relates to a motor vehicle (1) having at least two such oscillators (3), wherein a control device (9) of the motor vehicle (1) is designed in such a way that it controls the oscillators (3) according to the invention.

Description

Method for controlling at least two mechanical oscillators
Technical Field
The invention relates to a method for controlling at least two mechanical oscillators, in particular in a motor vehicle. The invention also relates to a motor vehicle having at least two mechanical oscillators controlled in this way.
Background
Mechanical oscillators, in particular vibrating motors, have a variety of uses. It is used in particular in motor vehicles in order to generate oscillations in a targeted manner. Such oscillators can be used in particular in seats of motor vehicles to generate oscillations that can be transmitted to the body of a passenger. Such oscillators are usually controlled by the power applied to the oscillator, in particular by the applied direct voltage. That is, the oscillation characteristics or frequency of the respective oscillator can be varied and thus controlled by means of a variation in the applied power. Such oscillators are usually arranged or embedded in the medium, in particular the upholstery, of such seats. The oscillation characteristics, in particular the respective oscillator frequencies in relation to the applied voltage, are distinguished in the embedded state in a medium from the free state or the state embedded in another medium. Therefore, in order to use the respective oscillators accurately or specifically, it is necessary to know oscillation characteristics or frequencies of the respective oscillators in a state of being embedded in a medium.
If the oscillators are not matched to one another, for example, an oscillation of the respective oscillator or an undesired superposition of the frequencies of the oscillators may result, which in particular leads to a so-called undesired wobble.
To determine the frequency of the corresponding oscillator, the relationship between the power applied in a state of being embedded in the medium and the frequency may be recorded, and the frequency of the oscillator may be estimated based on the applied power. However, this way of determining the frequency and thus of controlling the oscillator is not reliable. In particular, material fatigue and aging processes, in particular of the respective oscillator and/or medium, may result in a corresponding change in the relationship between the applied power and the frequency of the oscillator.
In order to solve this problem, it is possible in principle to provide an associated sensor on the respective oscillator in order to determine and optionally adjust the oscillation behavior of the respective oscillator, in particular the frequency of the respective oscillator, during operation. Such sensors are usually pulse generators or inductive sensors or hall sensors. Optical sensors are also contemplated. This has the disadvantage that additional components are required to implement such oscillators and the implementation is difficult. Furthermore, the sensor arranged on the oscillator oscillates together with the oscillator, so that damage and/or accelerated aging processes occur over time and accordingly incorrect results are produced.
Disclosure of Invention
In view of the above, the object of the present invention is to provide improved embodiments for a method for controlling at least two mechanical oscillators and for a motor vehicle having at least two such mechanical oscillators controlled in the manner described above, which embodiments are characterized in particular by a simplified and/or reliable and/or cost-effective control of the oscillators.
The solution of the invention to achieve the above object is the subject of the independent claims. Advantageous embodiments are described in the dependent claims.
The basic idea of the invention is to record the oscillations of at least two oscillators by means of an audio transducer, to convert the recorded signals into a fourier spectrum, and then to determine the frequencies of the respective oscillators in said fourier spectrum by means of assigning extrema. In the event of a difference between the measured frequency and the desired frequency, the frequency of the respective oscillator can then be adjusted according to the preset or desired frequency by varying the power applied to the respective oscillator. That is, with the solution of the invention, the frequencies of a plurality of oscillators can be determined accurately with a single sensor, i.e. an audio transducer. This allows a simplified and precise control of the oscillator. In addition, no additional sensors are provided on the respective oscillators, so that the implementation of the control of the oscillators is simplified.
According to the inventive concept, each oscillator oscillates in operation at a frequency, wherein the frequency of the respective oscillator can be controlled by the power applied to this oscillator. According to the invention, a single such audio transducer is arranged at a distance from the oscillator and receives an electrical signal with the audio transducer in operation. The received electrical signal is fourier transformed to determine the fourier spectrum. The frequency of the respective oscillator is then determined from the extreme values of the fourier spectrum. In particular, the frequency of the respective oscillator is determined from a peak in the fourier spectrum, i.e. the frequency corresponds in particular to this peak.
Of course, the electrical signal received by means of the audio transducer can be additionally processed before or after the fourier transformation is carried out in order to exclude or eliminate, in particular, errors and the like.
Once a difference is found between the measured frequency of the oscillator and the desired or preset frequency, the measured frequency can be adjusted accordingly to the desired frequency by changing the power applied to the oscillator accordingly.
The power applied to the respective oscillator is in particular electrical power. At least one of these oscillators, preferably each oscillator, is operated, preferably by applying a direct voltage. This enables a simplified control of the frequency of the respective oscillator, in particular due to the possible simple correlation between the applied voltage and the frequency of the oscillator.
According to a preferred embodiment, the respective oscillator is assigned a corresponding characteristic in the fourier spectrum. Subsequently, the frequency of the respective oscillator is determined from the extrema, in particular the peaks, of the corresponding characteristic in the fourier spectrum. This makes it possible in particular to distinguish different oscillators in the fourier spectrum, so that the frequency of the respective oscillator can be reliably determined.
The characteristic curves of the respective oscillators are preferably assigned as follows: the respective oscillators are operated independently, and the corresponding characteristic curves are assigned by the fourier spectrum generated by the electrical signals. Each oscillator may be independently operated and assigned a corresponding characteristic during a calibration process that may be performed at one time or at regular intervals. It is likewise possible to carry out such a calibration before the respective joint operation of the oscillators.
Preferably, each of the oscillators and the audio transducer are disposed in the same medium. Thus, the propagation of the frequency of each oscillator towards the audio transducer has the same or at least similar characteristics. This enables a more accurate determination of the frequency of the oscillator and/or a comparison of the oscillation characteristics of the oscillator.
In principle it is possible to operate both of the oscillators at the same or similar frequencies.
The oscillators are preferably operated at different frequencies. That is, the frequencies of these oscillators are different from each other. This allows, on the one hand, a more precise determination of the frequency of the respective oscillator. On the other hand, undesired superposition of the frequencies of the oscillators, in particular of chatter, e.g. of beat tones, is thereby prevented or at least reduced.
These oscillators can in principle be of any design. At least one such oscillator may have an oscillating motor, in particular a vibration motor. That is, in operation the oscillator is operated at a rotational frequency, in particular a vibration frequency, which is controlled according to the invention.
In the case where the audio transducer converts the frequency received from the oscillator, in particular the sound received from the oscillator, into an electrical signal, the audio transducer may be of any design. In particular, piezoelectric audio transducers can be used, which allow more precise recording of electrical signals.
The oscillator and the method of the invention can be used for any purpose. The oscillator and the method can be used in particular for motor vehicles. The method is preferably carried out by a correspondingly designed control device.
The oscillator is preferably used in a seat of a motor vehicle and is used to transmit oscillations to the body of a passenger of the motor vehicle. In other words, the passenger can be stimulated in a tactile manner, in particular massaged, in particular by means of an oscillator. Structural vibrations can likewise be generated in the body of the passenger by means of the oscillator.
The audio transducer and the oscillator are preferably arranged in the same medium. That is, if the oscillator is disposed in a seat of an automobile, the oscillator and the audio converter are preferably disposed in a cushion of the seat.
It should be noted that the audio transducer is fixedly arranged on the respective device, in particular does not itself oscillate, in order to determine the frequency of the oscillator accurately.
Further important features and advantages of the invention are described in the dependent claims, the figures and the description of the figures in connection with the figures.
It is understood that the features mentioned above and those yet to be explained below can be combined in the manner given in the present application, but also in other combinations or applied separately within the scope of the invention.
Drawings
The accompanying drawings, in which like reference numerals refer to identical or similar or functionally-identical elements, illustrate preferred embodiments of the present invention and are described in detail in the following description.
In the figure:
figure 1 shows a very schematic diagram of the electrical diagram of a motor vehicle,
fig. 2 shows a flow chart for illustrating the method of the invention.
Detailed Description
In fig. 1, a motor vehicle 1 is shown in a simplified form in the form of a circuit diagram. A seat 2 of a motor vehicle 1 can be seen, in which several oscillators 3 are arranged at a distance from one another. The oscillator 3 is used to transmit the oscillation to the body of a passenger, not shown. For this purpose, an electrical power, in this case a dc voltage, is applied to the respective oscillator in such a way that the respective oscillator 3 oscillates at the corresponding frequency. Wherein a change in the applied power causes a corresponding change in the frequency of the corresponding oscillator 3. The respective oscillator 3 has an oscillation motor 4, for example a vibration motor 5. An audio transducer 6, in particular a piezoelectric audio transducer 6', is likewise integrated in the seat 2 and arranged at a distance from the oscillator 3. The oscillator 3 and the audio transducer 6 are arranged in the same medium 7 of the seat 2, in the example shown in a soft cushion 8. The audio transducer 6 is integrated in the medium 7 in such a way that it does not oscillate by itself.
Each oscillator 3 oscillates at a frequency, wherein these oscillations propagate through a medium 7 towards an audio transducer 6. The audio transducer 6 converts the received oscillations into an electrical signal. The respective oscillator 3 and the audio transducer 6 are connected to a control device 9, so that the control device 9 can in particular receive the electrical signal of the audio transducer 6 and carry out further processing, and can vary the power applied to the respective oscillator 3, in particular the dc voltage applied to the respective oscillator 3, and accordingly adjust the frequency of the oscillator 3.
Corresponding to fig. 2, the respective oscillators 3 are first operated independently in a first method step 10, which can also be referred to as a calibration step 10'. The electrical signal received by means of the audio transducer 6 is subjected to a fourier transformation in the control device 9 in order to create a fourier spectrum. In this case, the characteristic assigned to the individually operated oscillator 3 can be identified in the fourier spectrum. In other words, in a first method step 10, the respective oscillator 3 is assigned a corresponding characteristic curve in the fourier spectrum by independently operating the respective oscillator 3. In this case, the oscillators 3 are operated at different frequencies, so that the characteristic curves of the oscillators 3 differ sufficiently in the fourier spectrum to be easily distinguishable. Furthermore, operating the oscillators 3 at different frequencies makes it possible for the frequencies of the oscillators 3 not to be undesirably superimposed, in particular to produce a beat tone.
If a calibration is carried out in the first method step 10, normal operation of the oscillators 3 can be started, in particular in such a way that each oscillator 3 oscillates at a frequency by applying a corresponding power. In this operation, the electrical signal transmitted to the control device 9 is received in a second method step 11 by means of the audio transducer 6. In a third method step 12, the electrical signal recorded by the audio transducer 6 is subjected to a fourier transformation in order to determine a fourier spectrum. In the fourier spectrum, the respective oscillator 3 can be assigned a characteristic curve, in particular on the basis of the calibration carried out in the first method step 10. The respective characteristic curve has extreme values, in particular peaks, which are used to determine the frequency of the respective oscillator 3. The frequency of the respective oscillator 3 corresponds in particular to the peak of the corresponding characteristic curve in the fourier spectrum.
If the frequency of the respective oscillator 3 is determined, the determined frequency of the respective oscillator 3 is compared with a predetermined or desired frequency in a fourth method step 13. Once a difference between these frequencies is found, the power applied to the corresponding oscillator 3 is adjusted in order to adjust the measured frequency according to the desired frequency. Subsequently, the method 13 can return to method step 11, so that the recording of the electrical signal and the determination of the frequency of the respective oscillator 3 are repeated, in particular in cycles or at time intervals.
As an alternative, the method can likewise return to the first method step 10 after method step 13. The first method step 10 is preferably carried out at regular intervals and/or before a corresponding commissioning of the oscillator 3.

Claims (7)

1. A method of controlling at least two mechanical oscillators (3) in a seat (2) of a motor vehicle (1), wherein each mechanical oscillator (3) oscillates in operation at a frequency which is controlled by means of the power applied to the respective mechanical oscillator (3), wherein
A single audio transducer (6) is arranged at a distance from each of said mechanical oscillators (3),
receiving an electrical signal by means of the audio transducer (6),
the electrical signal is subjected to Fourier transform, thereby determining a Fourier spectrum,
determining the frequency of the corresponding mechanical oscillator (3) from the extreme values of the Fourier spectrum,
adjusting the determined corresponding frequency according to a preset frequency by varying the applied power,
each of the mechanical oscillator (3) and the audio transducer (6) is arranged in the same medium (7) of the seat (2).
2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,
it is characterized in that the preparation method is characterized in that,
the respective mechanical oscillator (3) is operated by applying a direct voltage.
3. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,
it is characterized in that the preparation method is characterized in that,
a characteristic curve is assigned to the respective mechanical oscillator (3) in the Fourier spectrum, and the frequency of the respective mechanical oscillator (3) is determined from the extremum of the respective characteristic curve.
4. The method of claim 3, wherein the first and second light sources are selected from the group consisting of,
it is characterized in that the preparation method is characterized in that,
the respective mechanical oscillators (3) are first operated independently, and the corresponding characteristic curves are assigned by the Fourier spectrum generated by the electrical signals.
5. The method of any one of claims 1 to 4,
it is characterized in that the preparation method is characterized in that,
operating each of said mechanical oscillators (3) at a different frequency.
6. A motor vehicle (1) having at least two mechanical oscillators (3), wherein the respective mechanical oscillators (3) oscillate in operation at corresponding frequencies, and each of the mechanical oscillators (3) and the audio transducer (6) are arranged in the same medium (7) of a seat (2) of the motor vehicle (1),
it is characterized in that
An audio transducer (6) arranged in the medium (7) at a distance from each of the mechanical oscillators (3),
control means (9) designed such that said control means (9) controls each of said mechanical oscillators (3) in a method according to any one of claims 1 to 5.
7. The automobile of claim 6, wherein the first and second drive wheels are mounted on the same frame,
it is characterized in that the preparation method is characterized in that,
at least one of the mechanical oscillators (3) has an oscillating motor (4).
CN201780035215.9A 2016-06-07 2017-06-01 Method for controlling at least two mechanical oscillators Active CN109311054B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016006989.9 2016-06-07
DE102016006989.9A DE102016006989A1 (en) 2016-06-07 2016-06-07 Method for controlling at least two mechanical oscillators
PCT/EP2017/000641 WO2017211445A1 (en) 2016-06-07 2017-06-01 Method for controlling at least two mechanical oscillators

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CN109311054B true CN109311054B (en) 2021-06-18

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JP (1) JP2019520971A (en)
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DE (1) DE102016006989A1 (en)
WO (1) WO2017211445A1 (en)

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US11349340B2 (en) * 2019-02-18 2022-05-31 Ibbx Inovação Em Sistemas De Software E Hardware Ltda System and method for optimizing the sensing of electromagnetic waves

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JP2019520971A (en) 2019-07-25
WO2017211445A1 (en) 2017-12-14
US11548423B2 (en) 2023-01-10
DE102016006989A1 (en) 2017-12-07
CN109311054A (en) 2019-02-05

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